$\overline{){\mathbf{P}}{\mathbf{=}}\frac{\mathbf{F}\mathbf{}\mathbf{\left(}\mathbf{N}\mathbf{\right)}}{\mathbf{A}\mathbf{}\mathbf{\left(}{\mathbf{m}}^{\mathbf{2}}\mathbf{\right)}}}$

P_{10} = P_{atm} + P_{Water}

1 Pa = 1 N/m^{2} (1 N in a cross-section of 1^{ }m^{2} )

A)

Weight is a force. Thus, the correct answer is

A) The pressure at 10 m below the surface of the ocean is about 2.00×10^{5 }Pa.

Which of the following statements is true?

a) The weight of a column of seawater 1 m^{2} in cross section and 10 m high is about 2.00×10^{5 }N.

b) The weight of a column of seawater 1 m^{2} in cross section and 10 m high plus the weight of a column of air with the same cross-section extending up to the top of the atmosphere is about 2.00×10^{5 } N.

c) The weight of 1 m^{3} of seawater at 10 m below the surface of the ocean is about 2.00×10^{5 }N.

d) The density of seawater is about 2.00×10^{5} times the density of air at sea level.

B) Now consider the pressure at 20 m below the surface of the ocean.

The pressure is

a) twice that at a depth of 10 m

b) the same as that at a depth of 10 m

c) equal to that at a depth of 10 m plus the weight of a column of seawater 1 m^{2} in cross section and 10 m high.

d) equal to the weight of a column of seawater 1 m^{2} in cross section and 20 m high.